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No, you can't, but that's a deliberate decision, as cutting and pasting makes your
notebook very unreproducible (you cannot change something at the top and have the
effects of that change automatically propagate to the remainder). But there is a better
(IMHO) way to do something with a similar effect. I have started writing something more about this a chapter of the new reference manual, see

Thanks, Kasper. This is really good to keep in mind.
Zooming function would be helpful if one wants to deal with simplifying the Gamma matrices using the chirality of spinor with \Gamma_{11}, for instance.